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A Clinical Trial to Determine the Effect of Lutropin Alfa on Embryo Quality and Implantation Rate in Advanced Reproductive Age

Exploratory Study to Determine the Effect of Lutropin Alfa on Embryo Quality and Their Implantation in Women of Advanced Reproductive Age

Status
Terminated
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT01075815
Enrollment
76
Registered
2010-02-25
Start date
2008-11-30
Completion date
2010-10-31
Last updated
2014-02-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Infertility, Ovulation Induction

Keywords

Infertility, Ovulation induction, Luveris, Controlled ovarian stimulation, Reproductive technologies, assisted

Brief summary

This is a multicentric, open, randomized, comparative trial aimed to assess the influence of recombinant luteinizing hormone (r-LH) supplementation during controlled ovarian stimulation (COS) in advanced reproductive age in terms of improved embryo competence which allows to transfer less embryos to avoid high grade multiple pregnancy without reducing the pregnancy rate.

Detailed description

This study will be carried out by the Grupo de Interés de Salud Embrionaria (GISE) group (part of the Spanish Fertility Society) who uses strict criteria to select the embryos most suitable for successful transference. OBJECTIVES Primary objective: * To determine the benefit of r-LH supplementation in COS prior to in-vitro fertilization (IVF)/intracytosolic sperm injection (ICSI) in advanced reproductive age, in terms of embryo competence to implant, as compared against no r-LH supplementation Secondary objectives: To evaluate the benefit of r-LH supplementation in COS, in terms of: * follicular development * length of the stimulation * oocyte number and their maturity * fertilization rate * embryo number and quality * gestational sacs * abortion * ongoing pregnancies * local and systemic safety of r-LH administration The study will consist of 2 groups randomized in 1:1 ratio and each subject would be followed up until the confirmation of her pregnancy status. Each subject will be administered gonadotropin releasing hormone (GnRH) agonist subcutaneously daily from previous mid luteal phase to r-hCG administration as a standard practice to achieve down regulation. Each subject will also be administered recombinant follicle stimulating hormone (r-FSH) at a starting dose of 300 IU from S1 up to ovarian stimulation completion (r-hCG day) as a part of standard practice. In addition to the above concurrent therapies, one group will be administered experimental treatment (Luveris®) and the other group (control group) will not be administered any other drug (control treatment) during the stimulation period from stimulation start (S1) up to ovarian stimulation completion or stimulation cancellation respectively. Ovarian stimulation on an average takes 11 days and it is expected that stimulation period will not be extended beyond 15 days. A single injection of r-hCG will be administered intramuscularly or subcutaneously after the last injection of Luveris or r-FSH to achieve final follicular maturation. After, 34-36 hours of administration of r-hCG OPU will be done for oocyte retrieval and embryo transfer (ET) will be conducted within 5 days from OPU. Subjects will also be provided luteal support with natural progesterone and will be followed until delivery or miscarriage. Ultrasound and estradiol (E2) assessment of follicular growth will be conducted at various time points during the stimulation period with or without treatment adjustment.

Interventions

DRUGRecombinant human luteinizing hormone (rhLH)

Sponsors

Merck, S.L., Spain
CollaboratorINDUSTRY
Merck KGaA, Darmstadt, Germany
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
FEMALE
Age
35 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Pre-menopausal female subject aged greater than (\>) 35 years * Subjects with baseline FSH serum level less than or equal to (\<=) 10 IU/liter (l), LH and E2 levels within local normal range and plasma prolactin levels \< 30 nanogram/milliliter (ng/ml) * Subjects with regular spontaneous menstrual cycles of 25-35 days * Subjects with infertility justifying IVF/ICSI-ET treatment * Subjects programmed for COS with r-FSH under GnRH agonist protocol * Sperm from current male partner suitable for IVF/ICSI according to local lab, unless sperm donor is foreseen * Subjects with presence of both ovaries * Subjects whose uterine cavity is able to sustain embryo implantation or pregnancy * Subjects with normal papanicolaou test (PAP) smear within previous 3 years * Subjects with body mass index (BMI) \< 30 at stimulation start * Subjects who receive confirmation of not being pregnant by a negative beta-hCG test (urine or blood) prior to starting r-FSH administration * Subjects willing and able to comply with the protocol for the duration of the study * Subjects who have given informed consent prior to any study-related procedure not part of normal medical care

Exclusion criteria

* Subjects or her male partners who are known to be human immunodeficiency virus, hepatitis B virus or hepatitis C virus positive * Subjects with any clinically significant systemic disease; tumors of the hypothalamus and pituitary gland; ovarian, uterine or mammary cancer; hormonal abnormality and/or medical, biochemical, hematological condition which in the judgment of the investigator may interfere with gonadotropin treatment * Subjects with more than 2 previous assisted reproductive technologies (ART) cycles * Subjects in which previous cycles were cancelled due to poor response (\< 3 antral follicles after 15 day of stimulation) * Subjects with cryopreserved embryos from previous ART cycles * Subjects with unexplained gynecological bleeding * Subjects with polycystic ovaries, ovarian enlargement or cyst of unknown etiology * Subjects known to have any contraindication to being pregnant and/or carrying pregnancy to term * Subjects with known allergy to gonadotrophin preparations or any of the excipients * Subjects known to have any active substance abuse or history of drug, medication or alcohol abuse in the past 5 years * Subjects with previous entry into this study or simultaneous participation in another clinical drug trial * Subjects who have refused to or inability to comply with the protocol

Design outcomes

Primary

MeasureTime frameDescription
Implantation RateDay 35-42 post ovum pick-up (OPU) (34-38 hours post recombinant human choriogonadotropin day {end of stimulation cycle}[approximately 28 days])Implantation rate was measured as the number of gestational sacs observed, divided by the number of embryos transferred.

Secondary

MeasureTime frameDescription
Mean Number of Oocytes Retrieved34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])Mean number of oocytes retrieved per reporting group on the day of OPU (34-38 hours post r-hCG day (end of stimulation cycle \[approximately 28 days\]) was calculated. Oocyte retrieval is a technique used in in-vitro fertilization in order to remove oocytes from the ovary of the female, enabling fertilization outside the body.
Number of Mature Oocytes Retrieved34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])Number of mature oocytes retrieved per reporting group on the day of OPU (34-38 hours post r-hCG day (end of stimulation cycle \[approximately 28 days\]) was calculated. Oocyte retrieval is a technique used in in-vitro fertilization in order to remove oocytes from the ovary of the female, enabling fertilization outside the body. The nuclear maturity was evaluated based on the presence of a germinal vesicle (GV) or whether oocytes were in metaphase I (Meta-I) or II (Meta-II) stage.
Number of Fertilized Oocytes (2 Pronuclei [PN])34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])Oocytes were fertilized using Intra-cytoplasmic Sperm Injection (ICSI) technique which is an in-vitro fertilization procedure in which a single sperm is injected directly into an egg under a microscope. The appearance of two 2PN is the first sign of successful fertilization as observed during in vitro fertilization, and is usually observed after ICSI. The zygote is then termed 2PN.
Number and Quality of EmbryosDay 2-3 post OPU (34-38 hours post r-hCG day {end of stimulation cycle}[approximately 28 days])Embryos were graded according to Spanish Association for the Study of Reproductive Biology (ASEBIR) criteria into different categories: (A) optimal quality with maximum capacity for implantation, (B) good quality with a high capacity for implantation, (C) regular with low possibility of implantation and (D) poor quality with very little possibility of implantation.
Number of Participants With Biochemical Pregnancies2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])Biochemical pregnancy was defined as a pregnancy diagnosed only by the detection of hCG in serum or urine and that does not develop into a clinical pregnancy.
Number of Participants With Clinical Pregnancies2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])Clinical pregnancy was defined as pregnancy diagnosed by ultrasonographic visualization of one or more gestational sacs or definitive clinical signs of pregnancy. It includes ectopic pregnancy.
Total Dose of Recombinant Follicle Stimulating Hormone (r-FSH)2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])
Mean Number of Follicles Greater Than or Equal to 14 Millimeter (mm) on Recombinant Human Choriogonadotropin (r-hCG) Dayr-hCG day (end of stimulation cycle [approximately 28 days])
Number of Ovarian Stimulation DaysS1 up to r-hCG day (end of stimulation cycle [approximately 28 days])Ovarian stimulation included from first rFSH injection (S1) until day on which r-hCG was administered (r-hCG day). This period was divided into 2 parts: the first period in which 300 International Unit (IU) rFSH dose was constant and which covered from S1 to Day 4 of stimulation period (S4); the second period in which the rFSH dose could be adjusted depending on the ovarian response and which began on S4 and finished on the day on which the criteria for administration of r-hCG to induce the final follicular maturation were met.
Number of Recombinant Human Choriogonadotropin (r-hCG) Cycles Cancelled Due to Poor ResponseUp to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])Poor response was defined as 3 or less follicles of greater than or equal to 12 mm developing following at least 7 days of study treatment.
Total Number of BirthsUp to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])Total number of births per reporting group was calculated.
Number of Participants With Adverse Events (AEs)Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship.
Number of Participants With Ovarian Hyper Stimulation Syndrome (OHSS)Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])OHSS is a syndrome which can manifest with enlarged ovaries, advanced ascites with increased vascular permeability, pleural fluid accumulation, hemoconcentration, and increased blood clotting.
Number of Cycles Cancelled Due to Risk of Ovarian Hyper Stimulation Syndrome (OHSS)Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])OHSS is a syndrome which can manifest with enlarged ovaries, advanced ascites with increased vascular permeability, pleural fluid accumulation, hemoconcentration, and increased blood clotting.
Estradiol (E2) Levels on r-hCG Dayr-hCG day (end of stimulation cycle [approximately 28 days])

Countries

Spain

Participant flow

Pre-assignment details

One out of 76 randomized participants did not receive study medication.

Participants by arm

ArmCount
rFSH + rhLH
Recombinant human luteinizing hormone (rhLH, Luveris®) injection 150 International Units (IU) subcutaneously daily along with recombinant follicle-stimulating hormone (rFSH) 300 IU subcutaneously daily from Day 1 of stimulation period (S1) to Day 4 of stimulation period (S4) and then rFSH dose adjusted depending on the ovarian response till recombinant human choriogonadotropin (r-hCG) administration day.
40
rFSH
Recombinant follicle stimulating hormone (rFSH) injection 300 IU subcutaneously daily from S1 to S4 and then dose adjusted depending on the ovarian response till r-hCG administration day.
35
Total75

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyWithdrawal before r-hCG administration61
Overall StudyWithdrawal between OPU - embryo transfer32
Overall StudyWithdrawal between rhCG-ovum pickup(OPU)11

Baseline characteristics

CharacteristicrFSH + rhLHrFSHTotal
Age, Continuous37.2 years
STANDARD_DEVIATION 2.2
37.3 years
STANDARD_DEVIATION 1.5
37.2 years
STANDARD_DEVIATION 1.9
Sex: Female, Male
Female
40 Participants35 Participants75 Participants
Sex: Female, Male
Male
0 Participants0 Participants0 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
— / —— / —
other
Total, other adverse events
17 / 408 / 35
serious
Total, serious adverse events
2 / 401 / 35

Outcome results

Primary

Implantation Rate

Implantation rate was measured as the number of gestational sacs observed, divided by the number of embryos transferred.

Time frame: Day 35-42 post ovum pick-up (OPU) (34-38 hours post recombinant human choriogonadotropin day {end of stimulation cycle}[approximately 28 days])

Population: Intention to treat (ITT) population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHImplantation Rate0.2 sacs per embryoStandard Deviation 0.4
rFSHImplantation Rate0.2 sacs per embryoStandard Deviation 0.3
p-value: 0.876295% CI: [-0.1546, 0.1568]Wilcoxon two sample test
Secondary

Estradiol (E2) Levels on r-hCG Day

Time frame: r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication. Here N represents the number of participants with plasma E2 levels at r-hCG day.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHEstradiol (E2) Levels on r-hCG Day1890.2 picogram/milliter (pg/mL)Standard Deviation 1084.4
rFSHEstradiol (E2) Levels on r-hCG Day1621 picogram/milliter (pg/mL)Standard Deviation 827.8
p-value: 0.4164Wilcoxon two sample test
Secondary

Mean Number of Follicles Greater Than or Equal to 14 Millimeter (mm) on Recombinant Human Choriogonadotropin (r-hCG) Day

Time frame: r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHMean Number of Follicles Greater Than or Equal to 14 Millimeter (mm) on Recombinant Human Choriogonadotropin (r-hCG) Day7.7 folliclesStandard Deviation 4.9
rFSHMean Number of Follicles Greater Than or Equal to 14 Millimeter (mm) on Recombinant Human Choriogonadotropin (r-hCG) Day8.7 folliclesStandard Deviation 4
p-value: 0.3589ANOVA
Secondary

Mean Number of Oocytes Retrieved

Mean number of oocytes retrieved per reporting group on the day of OPU (34-38 hours post r-hCG day (end of stimulation cycle \[approximately 28 days\]) was calculated. Oocyte retrieval is a technique used in in-vitro fertilization in order to remove oocytes from the ovary of the female, enabling fertilization outside the body.

Time frame: 34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHMean Number of Oocytes Retrieved5.9 oocytesStandard Deviation 3.9
rFSHMean Number of Oocytes Retrieved7.7 oocytesStandard Deviation 4
p-value: 0.0629Wilcoxon two sample test
Secondary

Number and Quality of Embryos

Embryos were graded according to Spanish Association for the Study of Reproductive Biology (ASEBIR) criteria into different categories: (A) optimal quality with maximum capacity for implantation, (B) good quality with a high capacity for implantation, (C) regular with low possibility of implantation and (D) poor quality with very little possibility of implantation.

Time frame: Day 2-3 post OPU (34-38 hours post r-hCG day {end of stimulation cycle}[approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication. Here N represents the number of participants who had at least one fertilized oocyte.

ArmMeasureGroupValue (NUMBER)
rFSH + rhLHNumber and Quality of EmbryosA + B (good quality)69 embyros
rFSH + rhLHNumber and Quality of EmbryosC + D (poor quality)56 embyros
rFSH + rhLHNumber and Quality of EmbryosTotal embryos125 embyros
rFSHNumber and Quality of EmbryosA + B (good quality)65 embyros
rFSHNumber and Quality of EmbryosC + D (poor quality)73 embyros
rFSHNumber and Quality of EmbryosTotal embryos138 embyros
Secondary

Number of Cycles Cancelled Due to Risk of Ovarian Hyper Stimulation Syndrome (OHSS)

OHSS is a syndrome which can manifest with enlarged ovaries, advanced ascites with increased vascular permeability, pleural fluid accumulation, hemoconcentration, and increased blood clotting.

Time frame: Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: Safety population included all participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Cycles Cancelled Due to Risk of Ovarian Hyper Stimulation Syndrome (OHSS)1 cycles
rFSHNumber of Cycles Cancelled Due to Risk of Ovarian Hyper Stimulation Syndrome (OHSS)0 cycles
Secondary

Number of Fertilized Oocytes (2 Pronuclei [PN])

Oocytes were fertilized using Intra-cytoplasmic Sperm Injection (ICSI) technique which is an in-vitro fertilization procedure in which a single sperm is injected directly into an egg under a microscope. The appearance of two 2PN is the first sign of successful fertilization as observed during in vitro fertilization, and is usually observed after ICSI. The zygote is then termed 2PN.

Time frame: 34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Fertilized Oocytes (2 Pronuclei [PN])128 2PN oocytes
rFSHNumber of Fertilized Oocytes (2 Pronuclei [PN])136 2PN oocytes
p-value: 0.095Fisher Exact
Secondary

Number of Mature Oocytes Retrieved

Number of mature oocytes retrieved per reporting group on the day of OPU (34-38 hours post r-hCG day (end of stimulation cycle \[approximately 28 days\]) was calculated. Oocyte retrieval is a technique used in in-vitro fertilization in order to remove oocytes from the ovary of the female, enabling fertilization outside the body. The nuclear maturity was evaluated based on the presence of a germinal vesicle (GV) or whether oocytes were in metaphase I (Meta-I) or II (Meta-II) stage.

Time frame: 34-38 hours post r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Mature Oocytes Retrieved234 mature oocytes
rFSHNumber of Mature Oocytes Retrieved271 mature oocytes
p-value: 0.4728ANOVA
Secondary

Number of Ovarian Stimulation Days

Ovarian stimulation included from first rFSH injection (S1) until day on which r-hCG was administered (r-hCG day). This period was divided into 2 parts: the first period in which 300 International Unit (IU) rFSH dose was constant and which covered from S1 to Day 4 of stimulation period (S4); the second period in which the rFSH dose could be adjusted depending on the ovarian response and which began on S4 and finished on the day on which the criteria for administration of r-hCG to induce the final follicular maturation were met.

Time frame: S1 up to r-hCG day (end of stimulation cycle [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHNumber of Ovarian Stimulation Days9.7 DaysStandard Deviation 2.1
rFSHNumber of Ovarian Stimulation Days9.8 DaysStandard Deviation 1.9
p-value: 0.5952Wilcoxon two sample test
Secondary

Number of Participants With Adverse Events (AEs)

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship.

Time frame: Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: Safety population included all participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Participants With Adverse Events (AEs)19 participants
rFSHNumber of Participants With Adverse Events (AEs)9 participants
Secondary

Number of Participants With Biochemical Pregnancies

Biochemical pregnancy was defined as a pregnancy diagnosed only by the detection of hCG in serum or urine and that does not develop into a clinical pregnancy.

Time frame: 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Participants With Biochemical Pregnancies11 participants
rFSHNumber of Participants With Biochemical Pregnancies10 participants
p-value: 0.917995% CI: [0.4655, 1.99]Chi-squared
Secondary

Number of Participants With Clinical Pregnancies

Clinical pregnancy was defined as pregnancy diagnosed by ultrasonographic visualization of one or more gestational sacs or definitive clinical signs of pregnancy. It includes ectopic pregnancy.

Time frame: 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Participants With Clinical Pregnancies10 participants
rFSHNumber of Participants With Clinical Pregnancies10 participants
p-value: 0.727195% CI: [0.4133, 1.8524]Chi-squared
Secondary

Number of Participants With Ovarian Hyper Stimulation Syndrome (OHSS)

OHSS is a syndrome which can manifest with enlarged ovaries, advanced ascites with increased vascular permeability, pleural fluid accumulation, hemoconcentration, and increased blood clotting.

Time frame: Baseline up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: Safety population included all participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Participants With Ovarian Hyper Stimulation Syndrome (OHSS)1 participants
rFSHNumber of Participants With Ovarian Hyper Stimulation Syndrome (OHSS)0 participants
Secondary

Number of Recombinant Human Choriogonadotropin (r-hCG) Cycles Cancelled Due to Poor Response

Poor response was defined as 3 or less follicles of greater than or equal to 12 mm developing following at least 7 days of study treatment.

Time frame: Up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (NUMBER)
rFSH + rhLHNumber of Recombinant Human Choriogonadotropin (r-hCG) Cycles Cancelled Due to Poor Response4 cycles
rFSHNumber of Recombinant Human Choriogonadotropin (r-hCG) Cycles Cancelled Due to Poor Response1 cycles
Secondary

Total Dose of Recombinant Follicle Stimulating Hormone (r-FSH)

Time frame: 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication.

ArmMeasureValue (MEAN)Dispersion
rFSH + rhLHTotal Dose of Recombinant Follicle Stimulating Hormone (r-FSH)2812.2 IUStandard Deviation 719.4
rFSHTotal Dose of Recombinant Follicle Stimulating Hormone (r-FSH)2970.3 IUStandard Deviation 748.2
p-value: 0.3267Wilcoxon two sample test
Secondary

Total Number of Births

Total number of births per reporting group was calculated.

Time frame: Up to 2 months after OPU (34-38 hours post r-hCG day {end of stimulation cycle} [approximately 28 days])

Population: ITT population included all randomized participants who had received at least 1 dose of the study medication. Here N represents number of participants evaluated for this measure.

ArmMeasureValue (NUMBER)
rFSH + rhLHTotal Number of Births10 births
rFSHTotal Number of Births9 births
p-value: 0.885295% CI: [0.4347, 2.0518]Chi-squared

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026